ceph/src/boost/libs/context/src/asm/ontop_ppc32_sysv_elf_gas.S

   1 /*
   2             Copyright Oliver Kowalke 2009.
   3    Distributed under the Boost Software License, Version 1.0.
   4       (See accompanying file LICENSE_1_0.txt or copy at
   5           http://www.boost.org/LICENSE_1_0.txt)
   6 */
   7
   8 /*******************************************************
   9  *                                                     *
  10  *  -------------------------------------------------  *
  11  *  |  0  |  4  |  8  |  12 |  16 |  20 |  24 |  28 |  *
  12  *  -------------------------------------------------  *
  13  *  |bchai|hiddn|   fpscr   |  PC |  CR | R14 | R15 |  *
  14  *  -------------------------------------------------  *
  15  *  -------------------------------------------------  *
  16  *  |  32 |  36 |  40 |  44 |  48 |  52 |  56 |  60 |  *
  17  *  -------------------------------------------------  *
  18  *  | R16 | R17 | R18 | R19 | R20 | R21 | R22 | R23 |  *
  19  *  -------------------------------------------------  *
  20  *  -------------------------------------------------  *
  21  *  |  64 |  68 |  72 |  76 |  80 |  84 |  88 |  92 |  *
  22  *  -------------------------------------------------  *
  23  *  | R24 | R25 | R26 | R27 | R28 | R29 | R30 | R31 |  *
  24  *  -------------------------------------------------  *
  25  *  -------------------------------------------------  *
  26  *  |  96 | 100 | 104 | 108 | 112 | 116 | 120 | 124 |  *
  27  *  -------------------------------------------------  *
  28  *  |    F14    |    F15    |    F16    |    F17    |  *
  29  *  -------------------------------------------------  *
  30  *  -------------------------------------------------  *
  31  *  | 128 | 132 | 136 | 140 | 144 | 148 | 152 | 156 |  *
  32  *  -------------------------------------------------  *
  33  *  |    F18    |    F19    |    F20    |    F21    |  *
  34  *  -------------------------------------------------  *
  35  *  -------------------------------------------------  *
  36  *  | 160 | 164 | 168 | 172 | 176 | 180 | 184 | 188 |  *
  37  *  -------------------------------------------------  *
  38  *  |    F22    |    F23    |    F24    |    F25    |  *
  39  *  -------------------------------------------------  *
  40  *  -------------------------------------------------  *
  41  *  | 192 | 196 | 200 | 204 | 208 | 212 | 216 | 220 |  *
  42  *  -------------------------------------------------  *
  43  *  |    F26    |    F27    |    F28    |    F29    |  *
  44  *  -------------------------------------------------  *
  45  *  ------------------------|------------              *
  46  *  | 224 | 228 | 232 | 236 | 240 | 244 |              *
  47  *  ------------------------|------------              *
  48  *  |    F30    |    F31    |bchai|  LR |              *
  49  *  ------------------------|------------              *
  50  *                                                     *
  51  *******************************************************/
  52
  53 .file "ontop_ppc32_sysv_elf_gas.S"
  54 .text
  55 .globl ontop_fcontext
  56 .align 2
  57 .type ontop_fcontext,@function
  58 ontop_fcontext:
  59     # Linux: ontop_fcontext( hidden transfer_t * R3, R4, R5, R6)
  60     # Other: transfer_t R3:R4 = jump_fcontext( R3, R4, R5)
  61
  62     mflr  %r0  # return address from LR
  63     mffs  %f0  # FPSCR
  64     mfcr  %r8  # condition register
  65
  66     stwu  %r1, -240(%r1)  # allocate stack space, R1 % 16 == 0
  67     stw   %r0, 244(%r1)   # save LR in caller's frame
  68
  69 #ifdef __linux__
  70     stw   %r3, 4(%r1)   # hidden pointer
  71 #endif
  72
  73     stfd  %f0, 8(%r1)   # FPSCR
  74     stw   %r0, 16(%r1)  # LR as PC
  75     stw   %r8, 20(%r1)  # CR
  76
  77     # Save registers R14 to R31.
  78     # Don't change R2, the thread-local storage pointer.
  79     # Don't change R13, the small data pointer.
  80     stw   %r14, 24(%r1)
  81     stw   %r15, 28(%r1)
  82     stw   %r16, 32(%r1)
  83     stw   %r17, 36(%r1)
  84     stw   %r18, 40(%r1)
  85     stw   %r19, 44(%r1)
  86     stw   %r20, 48(%r1)
  87     stw   %r21, 52(%r1)
  88     stw   %r22, 56(%r1)
  89     stw   %r23, 60(%r1)
  90     stw   %r24, 64(%r1)
  91     stw   %r25, 68(%r1)
  92     stw   %r26, 72(%r1)
  93     stw   %r27, 76(%r1)
  94     stw   %r28, 80(%r1)
  95     stw   %r29, 84(%r1)
  96     stw   %r30, 88(%r1)
  97     stw   %r31, 92(%r1)
  98
  99     # Save registers F14 to F31 in slots with 8-byte alignment.
 100     # 4-byte alignment may stall the pipeline of some processors.
 101     # Less than 4 may cause alignment traps.
 102     stfd  %f14, 96(%r1)
 103     stfd  %f15, 104(%r1)
 104     stfd  %f16, 112(%r1)
 105     stfd  %f17, 120(%r1)
 106     stfd  %f18, 128(%r1)
 107     stfd  %f19, 136(%r1)
 108     stfd  %f20, 144(%r1)
 109     stfd  %f21, 152(%r1)
 110     stfd  %f22, 160(%r1)
 111     stfd  %f23, 168(%r1)
 112     stfd  %f24, 176(%r1)
 113     stfd  %f25, 184(%r1)
 114     stfd  %f26, 192(%r1)
 115     stfd  %f27, 200(%r1)
 116     stfd  %f28, 208(%r1)
 117     stfd  %f29, 216(%r1)
 118     stfd  %f30, 224(%r1)
 119     stfd  %f31, 232(%r1)
 120
 121     # store RSP (pointing to context-data) in R7/R6
 122     # restore RSP (pointing to context-data) from R4/R3
 123 #ifdef __linux__
 124     mr   %r7, %r1
 125     mr   %r1, %r4
 126     lwz  %r3, 4(%r1)   # hidden pointer
 127 #else
 128     mr   %r6, %r1
 129     mr   %r1, %r3
 130 #endif
 131
 132     # ignore PC at 16(%r1)
 133     lfd  %f0, 8(%r1)   # FPSCR
 134     lwz  %r8, 20(%r1)  # CR
 135
 136     mtfsf  0xff, %f0   # restore FPSCR
 137     mtcr   %r8         # restore CR
 138
 139     # restore R14 to R31
 140     lwz  %r14, 24(%r1)
 141     lwz  %r15, 28(%r1)
 142     lwz  %r16, 32(%r1)
 143     lwz  %r17, 36(%r1)
 144     lwz  %r18, 40(%r1)
 145     lwz  %r19, 44(%r1)
 146     lwz  %r20, 48(%r1)
 147     lwz  %r21, 52(%r1)
 148     lwz  %r22, 56(%r1)
 149     lwz  %r23, 60(%r1)
 150     lwz  %r24, 64(%r1)
 151     lwz  %r25, 68(%r1)
 152     lwz  %r26, 72(%r1)
 153     lwz  %r27, 76(%r1)
 154     lwz  %r28, 80(%r1)
 155     lwz  %r29, 84(%r1)
 156     lwz  %r30, 88(%r1)
 157     lwz  %r31, 92(%r1)
 158
 159     # restore F14 to F31
 160     lfd  %f14, 96(%r1)
 161     lfd  %f15, 104(%r1)
 162     lfd  %f16, 112(%r1)
 163     lfd  %f17, 120(%r1)
 164     lfd  %f18, 128(%r1)
 165     lfd  %f19, 136(%r1)
 166     lfd  %f20, 144(%r1)
 167     lfd  %f21, 152(%r1)
 168     lfd  %f22, 160(%r1)
 169     lfd  %f23, 168(%r1)
 170     lfd  %f24, 176(%r1)
 171     lfd  %f25, 184(%r1)
 172     lfd  %f26, 192(%r1)
 173     lfd  %f27, 200(%r1)
 174     lfd  %f28, 208(%r1)
 175     lfd  %f29, 216(%r1)
 176     lfd  %f30, 224(%r1)
 177     lfd  %f31, 232(%r1)
 178
 179     # restore LR from caller's frame
 180     lwz   %r0, 244(%r1)
 181     mtlr  %r0
 182
 183     # adjust stack
 184     addi  %r1, %r1, 240
 185
 186     # see tail_ppc32_sysv_elf_gas.cpp
 187     # Linux: fcontext_ontop_tail( hidden transfer_t * R3, R4, R5, R6, R7)
 188     # Other: transfer_t R3:R4 = fcontext_ontop_tail( R3, R4, R5, R6)
 189     b ontop_fcontext_tail
 190 .size ontop_fcontext, .-ontop_fcontext
 191
 192 /* Mark that we don't need executable stack.  */
 193 .section .note.GNU-stack,"",%progbits